Dell OptiPlex 755 User's Guide - Page 378

expansion slot - A connector on the system board (in some computers) where you insert an expansion card, connecting it to the system bus. ExpressCard - A removable I/O card adhering to the PCMCIA standard. Modems and network adapters are common types of ExpressCards. ExpressCards support both the PCI Express and USB 2.0 standard. Express Service Code - A numeric code located on a sticker on your Dell™ computer. Use the Express Service Code when contacting Dell for assistance. Express Service Code service may not be available in some countries. extended display mode - A display setting that allows you to use a second monitor as an extension of your display. Also referred to as dual display mode. extended PC Card - A PC Card that extends beyond the edge of the PC Card slot when installed. F Fahrenheit - A temperature measurement scale where 32° is the freezing point and 212° is the boiling point of water. FBD - fully-buffered DIMM - A DIMM with DDR2 DRAM chips and an Advanced Memory Buffer (AMB) that speeds communication between the DDR2 SDRAM chips and the system. FCC - Federal Communications Commission - A U.S. agency responsible for enforcing communications-related regulations that state how much radiation computers and other electronic equipment can emit. fingerprint reader - A strip sensor that uses your unique fingerprint to authenticate your user identity to help secure your computer. folder - A term used to describe space on a disk or drive where files are organized and grouped. Files in a folder can be viewed and ordered in various ways, such as alphabetically, by date, and by size. format - The process that prepares a drive or disk for file storage. When a drive or disk is formatted, the existing information on it is lost. FSB - front side bus - The data path and physical interface between the processor and RAM. FTP - file transfer protocol - A standard Internet protocol used to exchange files between computers connected to the Internet. G G - gravity - A measurement of weight and force. GB - gigabyte - A measurement of data storage that equals 1024 MB (1,073,741,824 bytes). When used to refer to hard drive storage, the term is often rounded to 1,000,000,000 bytes. GHz - gigahertz - A measurement of frequency that equals one thousand million Hz, or one thousand MHz. The speeds for computer processors, buses, and interfaces are often measured in GHz. graphics mode - A video mode that can be defined as x horizontal pixels by y vertical pixels by z colors. Graphics modes can display an unlimited variety of shapes and fonts. GUI - graphical user interface - Software that interacts with the user by means of menus, windows, and icons. Most programs that operate on the Windows operating systems are GUIs. H hard drive - A drive that reads and writes data on a hard disk. The terms hard drive and hard disk are often used interchangeably. heat sink - A metal plate on some processors that helps dissipate heat. hibernate mode - A power management mode that saves everything in memory to a reserved space on the hard drive and then turns off the computer. When you restart the computer, the memory information that was saved to the hard drive is automatically restored. HTTP - hypertext transfer protocol - A protocol for exchanging files between computers connected to the Internet. 378 Glossary